S
M
T
W
T
F
S
28
84°
58°
29
86°
62°
30
88°
63°
1
89°
64°
2
90°
65°
3
86°
62°
4
84°
60°
5
84°
62°
6
83°
61°
7
79°
58°
8
82°
61°
9
82°
64°
10
79°
61°
11
80°
62°
12
84°
65°
13
85°
64°
14
81°
62°
15
83°
64°
16
80°
62°
17
80°
61°
18
81°
62°
19
80°
59°
20
82°
64°
21
84°
65°
22
82°
63°
23
80°
59°
24
81°
62°
25
83°
62°
26
86°
65°
27
86°
65°
28
86°
64°
29
83°
65°
30
83°
64°
31
86°
66°
1
86°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Herndon
Herndon's July 2026 forecast shows daily high temperatures ranging from 79° to 90°, with overnight lows between 58° and 66°. The average high for July is 83° with an average low of 63°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Herndon. See also: August | September | October.
